[IMG align=right]http://i174.photobucket.com/albums/w88/DoctorOak/PokeWalk.png[/img]As detailed in this week's Pokemon Sunday, HG/SS will come with a brand new device bundled in with the game called a PokéWalker.
The device is a pedometer that is reminiscent of the Pokemon Pikachu toys that were around at the same time as the original Gold and Silver and played a large part in the mystery gift process back then, too. It also keeps the basic monochromatic look - but seems to be in true black and white, rather than Gameboy green.
The major difference here, though, is that the PokéWalker will let you transfer one of your Pokemon from HG/SS, and as you walk it will gain experience and happiness points as you go about your daily business - effectively removing the obstacle of grinding within the game in the traditional sense.
Also featured are a few little extras - such as finding items while you walk, that you can then send to your HG/SS game, or encountering wild Pokemon - although it's not currently known how that specific function works. Maybe you can even battle and capture Pokemon with the device? Or maybe it just makes your next encounter in HG/SS the Pokemon you found with the PokéWalker? Either way, the options available make it truly revolutionary for the games.
Obviously, as HG/SS doesn't have an American announcement, yet, this device can't be confirmed to be going outside of Japan. It seems unlikely, however, that it won't. Afterall, the Wireless adaptor served even less purpose and was still bundled with Fr/Lg everywhere...